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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9149656badbf59311d7971d0caf90c89b2f04868a1628e3389adfb822e8182' 
  AND token = '1mHDPoE9pIo6mSLMdARhOt+mTl7tQWdShUDC0pBLFqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}